John Trapp on Psalms 19:2

Verſ. 2. Day unto day uttereth ſpeech] Some read it, one day ſucceeding another uttereth (or Welleth out, Sicur fons ſcaturiens. R. Menahem. as a Fountain, continually, and plentifully) ſpeech, yet without ſound; by a dumb kind of eloquence, eructant; by a continual revolution and ſucceſs of days men are inſtructed concerning the Power and Providence of God, as alſo concerning his truth and faithfulneſs; for if God hath hitherto kept promiſe with Nights and Days, that one ſhall ſucceed the other; will he not much more keep promiſe with his people? Jer. 33.20, 25.

And Night unto Night ſheweth knowledge] Days and Nights by their perpetual courſe and order, Dei potentiam & ſapientiam concelebrant; there being no leſs neceſſity of the Night in its kind, than of the Day. The knowledge it ſheweth us, is, that man in himſelf is weak, and cannot long hold out hard labour; that he is permitted to ſleep a while, and take his reſt; that he muſt abridge himſelf of ſome part of his reſt to commune with his own heart on his bed, and be ſtill; that if hee beſtir not himſelf, and do up his work quickly, the Night of Death cometh, when no man can work, &c.